Vehicle interior illumination lamp

Abstract

A vehicle interior illumination lamp includes: a design panel including a light transmission portion in at least a part of a front surface side of the design panel; a light source configured to emit light toward the front surface side of the design panel; a reflector arranged at a position facing the light transmission portion of the design panel and configured to reflect light from the light source; a light guide prism arranged on the reflector at a side where the light source is positioned and configured to allow each of light from the light source and light reflected by the reflector to be incident on the light guide prism; and an emission prism arranged on the reflector so as to be adjacent to the light guide prism and configured to emit light guided through the light guide prism toward the light transmission portion of the design panel.

What is claimed is: 
     
         1 . A vehicle interior illumination lamp comprising:
 a design panel including a light transmission portion in at least a part of a front surface side of the design panel, the light transmission portion being configured to transmit light;   a light source configured to emit light toward the front surface side of the design panel;   a reflector arranged at a position facing the light transmission portion of the design panel and configured to reflect light from the light source;   a light guide prism arranged on the reflector at a side where the light source is positioned and configured to allow each of light from the light source and light reflected by the reflector to be incident on the light guide prism; and   an emission prism arranged on the reflector so as to be adjacent to the light guide prism and configured to emit light guided through the light guide prism toward the light transmission portion of the design panel, wherein   the light guide prism includes a plurality of second lens cuts arranged on a side surface of the light guide prism at a side of the reflector, and   the plurality of second lens cuts are configured to refract light guided from the light guide prism toward the emission prism.   
     
     
         2 . The vehicle interior illumination lamp according to  claim 1 , wherein the emission prism includes a plurality of first lens cuts arranged on a back surface of the emission prism at a side of the reflector and configured to refract light. 
     
     
         3 . The vehicle interior illumination lamp according to  claim 1 , wherein
 the light transmission portion includes a pair of light transmission portions arranged on both sides of the front surface side,   a portion of the design panel other than the pair of light transmission portions is a non-light transmission portion that does not transmit light, and   emission surfaces of the emission prism are arranged so as to face the pair of light transmission portions, respectively.